I like them. My favourite was a shop in Crewe in the 70's called "The Gasket Breakers." Basically a heap of random filthy engines behind a counter run by 3 similarly filthy Angels. Got a Suzuki 250 engine (with ram air fins) for £15. Fitted it and found 5th gear was missing. It had turned to iron filings and sludge. Took it back and they gave me a cog from the heap. It worked. Are there any shops like that left?